| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately, inexpensively and stably measure substantially 5-100 m of a liquid level, and especially, improve instability due to a contact type such as a pressure type water level gauge in which a sensor part comes into contact with water.SOLUTION: A problem is solved by adding a graduated-length-measuring-cable measured value to a displacer that is attached to the graduated length measuring cable to which tensile force is applied, and a liquid surface distance measured value from the displacer to a measurement water surface that is separately measured by a water level gauge with a short span.SELECTED DRAWING: Figure 1 |
